1 /* 2 * TI TPS65132 Regulator driver 3 * 4 * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved. 5 * 6 * Author: Venkat Reddy Talla <vreddytalla@nvidia.com> 7 * Laxman Dewangan <ldewangan@nvidia.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of the 12 * License, or (at your option) any later version. 13 * 14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, 15 * whether express or implied; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 */ 19 20 #include <linux/delay.h> 21 #include <linux/err.h> 22 #include <linux/gpio/consumer.h> 23 #include <linux/i2c.h> 24 #include <linux/module.h> 25 #include <linux/regmap.h> 26 #include <linux/regulator/driver.h> 27 #include <linux/regulator/machine.h> 28 29 #define TPS65132_REG_VPOS 0x00 30 #define TPS65132_REG_VNEG 0x01 31 #define TPS65132_REG_APPS_DISP_DISN 0x03 32 #define TPS65132_REG_CONTROL 0x0FF 33 34 #define TPS65132_VOUT_MASK 0x1F 35 #define TPS65132_VOUT_N_VOLTAGE 0x15 36 #define TPS65132_VOUT_VMIN 4000000 37 #define TPS65132_VOUT_VMAX 6000000 38 #define TPS65132_VOUT_STEP 100000 39 40 #define TPS65132_REG_APPS_DIS_VPOS BIT(0) 41 #define TPS65132_REG_APPS_DIS_VNEG BIT(1) 42 43 #define TPS65132_REGULATOR_ID_VPOS 0 44 #define TPS65132_REGULATOR_ID_VNEG 1 45 #define TPS65132_MAX_REGULATORS 2 46 47 #define TPS65132_ACT_DIS_TIME_SLACK 1000 48 49 struct tps65132_reg_pdata { 50 struct gpio_desc *en_gpiod; 51 struct gpio_desc *act_dis_gpiod; 52 unsigned int act_dis_time_us; 53 int ena_gpio_state; 54 }; 55 56 struct tps65132_regulator { 57 struct device *dev; 58 struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS]; 59 }; 60 61 static int tps65132_regulator_enable(struct regulator_dev *rdev) 62 { 63 struct tps65132_regulator *tps = rdev_get_drvdata(rdev); 64 int id = rdev_get_id(rdev); 65 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; 66 int ret; 67 68 if (!IS_ERR(rpdata->en_gpiod)) { 69 gpiod_set_value_cansleep(rpdata->en_gpiod, 1); 70 rpdata->ena_gpio_state = 1; 71 } 72 73 /* Hardware automatically enable discharge bit in enable */ 74 if (rdev->constraints->active_discharge == 75 REGULATOR_ACTIVE_DISCHARGE_DISABLE) { 76 ret = regulator_set_active_discharge_regmap(rdev, false); 77 if (ret < 0) { 78 dev_err(tps->dev, "Failed to disable active discharge: %d\n", 79 ret); 80 return ret; 81 } 82 } 83 84 return 0; 85 } 86 87 static int tps65132_regulator_disable(struct regulator_dev *rdev) 88 { 89 struct tps65132_regulator *tps = rdev_get_drvdata(rdev); 90 int id = rdev_get_id(rdev); 91 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; 92 93 if (!IS_ERR(rpdata->en_gpiod)) { 94 gpiod_set_value_cansleep(rpdata->en_gpiod, 0); 95 rpdata->ena_gpio_state = 0; 96 } 97 98 if (!IS_ERR(rpdata->act_dis_gpiod)) { 99 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1); 100 usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us + 101 TPS65132_ACT_DIS_TIME_SLACK); 102 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0); 103 } 104 105 return 0; 106 } 107 108 static int tps65132_regulator_is_enabled(struct regulator_dev *rdev) 109 { 110 struct tps65132_regulator *tps = rdev_get_drvdata(rdev); 111 int id = rdev_get_id(rdev); 112 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id]; 113 114 if (!IS_ERR(rpdata->en_gpiod)) 115 return rpdata->ena_gpio_state; 116 117 return 1; 118 } 119 120 static const struct regulator_ops tps65132_regulator_ops = { 121 .enable = tps65132_regulator_enable, 122 .disable = tps65132_regulator_disable, 123 .is_enabled = tps65132_regulator_is_enabled, 124 .list_voltage = regulator_list_voltage_linear, 125 .map_voltage = regulator_map_voltage_linear, 126 .get_voltage_sel = regulator_get_voltage_sel_regmap, 127 .set_voltage_sel = regulator_set_voltage_sel_regmap, 128 .set_active_discharge = regulator_set_active_discharge_regmap, 129 }; 130 131 static int tps65132_of_parse_cb(struct device_node *np, 132 const struct regulator_desc *desc, 133 struct regulator_config *config) 134 { 135 struct tps65132_regulator *tps = config->driver_data; 136 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id]; 137 int ret; 138 139 rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev, 140 "enable", 0, &np->fwnode, 0, "enable"); 141 if (IS_ERR(rpdata->en_gpiod)) { 142 ret = PTR_ERR(rpdata->en_gpiod); 143 144 /* Ignore the error other than probe defer */ 145 if (ret == -EPROBE_DEFER) 146 return ret; 147 return 0; 148 } 149 150 rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child( 151 tps->dev, "active-discharge", 0, 152 &np->fwnode, 0, "active-discharge"); 153 if (IS_ERR(rpdata->act_dis_gpiod)) { 154 ret = PTR_ERR(rpdata->act_dis_gpiod); 155 156 /* Ignore the error other than probe defer */ 157 if (ret == -EPROBE_DEFER) 158 return ret; 159 160 return 0; 161 } 162 163 ret = of_property_read_u32(np, "ti,active-discharge-time-us", 164 &rpdata->act_dis_time_us); 165 if (ret < 0) { 166 dev_err(tps->dev, "Failed to read active discharge time:%d\n", 167 ret); 168 return ret; 169 } 170 171 return 0; 172 } 173 174 #define TPS65132_REGULATOR_DESC(_id, _name) \ 175 [TPS65132_REGULATOR_ID_##_id] = { \ 176 .name = "tps65132-"#_name, \ 177 .supply_name = "vin", \ 178 .id = TPS65132_REGULATOR_ID_##_id, \ 179 .of_match = of_match_ptr(#_name), \ 180 .of_parse_cb = tps65132_of_parse_cb, \ 181 .ops = &tps65132_regulator_ops, \ 182 .n_voltages = TPS65132_VOUT_N_VOLTAGE, \ 183 .min_uV = TPS65132_VOUT_VMIN, \ 184 .uV_step = TPS65132_VOUT_STEP, \ 185 .enable_time = 500, \ 186 .vsel_mask = TPS65132_VOUT_MASK, \ 187 .vsel_reg = TPS65132_REG_##_id, \ 188 .active_discharge_off = 0, \ 189 .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \ 190 .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \ 191 .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \ 192 .type = REGULATOR_VOLTAGE, \ 193 .owner = THIS_MODULE, \ 194 } 195 196 static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = { 197 TPS65132_REGULATOR_DESC(VPOS, outp), 198 TPS65132_REGULATOR_DESC(VNEG, outn), 199 }; 200 201 static const struct regmap_range tps65132_no_reg_ranges[] = { 202 regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1, 203 TPS65132_REG_CONTROL - 1), 204 }; 205 206 static const struct regmap_access_table tps65132_no_reg_table = { 207 .no_ranges = tps65132_no_reg_ranges, 208 .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges), 209 }; 210 211 static const struct regmap_config tps65132_regmap_config = { 212 .reg_bits = 8, 213 .val_bits = 8, 214 .max_register = TPS65132_REG_CONTROL, 215 .cache_type = REGCACHE_NONE, 216 .rd_table = &tps65132_no_reg_table, 217 .wr_table = &tps65132_no_reg_table, 218 }; 219 220 static int tps65132_probe(struct i2c_client *client, 221 const struct i2c_device_id *client_id) 222 { 223 struct device *dev = &client->dev; 224 struct tps65132_regulator *tps; 225 struct regulator_dev *rdev; 226 struct regmap *rmap; 227 struct regulator_config config = { }; 228 int id; 229 int ret; 230 231 tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL); 232 if (!tps) 233 return -ENOMEM; 234 235 rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config); 236 if (IS_ERR(rmap)) { 237 ret = PTR_ERR(rmap); 238 dev_err(dev, "regmap init failed: %d\n", ret); 239 return ret; 240 } 241 242 i2c_set_clientdata(client, tps); 243 tps->dev = dev; 244 245 for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) { 246 config.regmap = rmap; 247 config.dev = dev; 248 config.driver_data = tps; 249 250 rdev = devm_regulator_register(dev, &tps_regs_desc[id], 251 &config); 252 if (IS_ERR(rdev)) { 253 ret = PTR_ERR(rdev); 254 dev_err(dev, "regulator %s register failed: %d\n", 255 tps_regs_desc[id].name, ret); 256 return ret; 257 } 258 } 259 return 0; 260 } 261 262 static const struct i2c_device_id tps65132_id[] = { 263 {.name = "tps65132",}, 264 {}, 265 }; 266 MODULE_DEVICE_TABLE(i2c, tps65132_id); 267 268 static struct i2c_driver tps65132_i2c_driver = { 269 .driver = { 270 .name = "tps65132", 271 }, 272 .probe = tps65132_probe, 273 .id_table = tps65132_id, 274 }; 275 276 module_i2c_driver(tps65132_i2c_driver); 277 278 MODULE_DESCRIPTION("tps65132 regulator driver"); 279 MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>"); 280 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 281 MODULE_LICENSE("GPL v2"); 282